Malicious PDF — malware analysis report

Static analysis result for SHA-256 4669141bb368bb2a…

MALICIOUS

PDF

83.7 KB Created: 2021-04-04 22:48:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 607bd0495df307ec5453cb0538ba6a52 SHA-1: 08021c78d9d78e96e35ebae4856f0fbc9db831f3 SHA-256: 4669141bb368bb2a8cc656ba5a03698fad6c86cdb4b56962b2a1e240200ecb34
232 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file contains a critical heuristic firing for a malicious redirector link, pointing to 'https://crophysi.ru/123?utm_term=andy+android+emulator+offline+highly+compressed'. The ML classifier also flagged it with high confidence. The presence of urgency and password-protected archive lures suggests a phishing or social engineering attempt to trick the user into downloading a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://crophysi.ru/123?utm_term=andy+android+emulator+offline+highly+compressed In PDF document text
    • https://devigejijakefu.weebly.com/uploads/1/3/2/7/132740662/kajilikova_wumufomofolav.pdfIn PDF document text
    • http://magexaxajatadog.getenjoyment.net/caracteristicas_gerais_das_angiospermas.pdfIn PDF document text
    • https://nisixokavenofaf.weebly.com/uploads/1/3/4/8/134891603/zapova.pdfIn PDF document text
    • http://wei-nmvc.com/pros_and_cons_of_building_a_nuclear_power_plantu4649.pdfIn PDF document text
    • http://womanaratiso.iblogger.org/zilizinuxepaw.pdfIn PDF document text
    • https://wubedalenab.weebly.com/uploads/1/3/1/3/131383767/59b7d8.pdfIn PDF document text
    • http://sozimaxetupow.mywebcommunity.org/41996192929.pdfIn PDF document text
    • http://banademebilite.sportsontheweb.net/selazur.pdfIn PDF document text
    • https://wobakasufafe.weebly.com/uploads/1/3/2/6/132682589/4582162.pdfIn PDF document text
    • http://logmeinnow.xyz/xegunewejusewituvugox549rc.pdfIn PDF document text
    • https://debasomi.weebly.com/uploads/1/3/0/7/130739769/doned.pdfIn PDF document text
    • http://obsluzhivanie-kompyuterov.moscow/zufalidaxapofuycsru.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/4b56fb8e-8807-4940-b611-12abe8abb61b/eb_games_tom_clancy_rainbow_six_siege.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7e3e9631-5036-40a4-8f07-122b7477d7de/months_of_the_year_worksheet_for_kinder.pdfIn PDF document text
    • http://jukasuxoseki.atwebpages.com/el_decameron_giovanni_boccaccio.pdfIn PDF document text
    • http://derizivazodox.rf.gd/53541420743.pdfIn PDF document text
    • http://bebovufuvuji.myartsonline.com/zatalebipubotiloleve.pdfIn PDF document text
    • https://s3.amazonaws.com/jesidofefe/vavipipavufukosa.pdfIn PDF document text
    • http://wojosuxe.epizy.com/neziditenemuserogekobalil.pdfIn PDF document text
    • https://s3.amazonaws.com/nademopor/kapetito.pdfIn PDF document text
    • http://xixupokolaxusuv.epizy.com/postman_api_documentation.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/82858b08-fdae-4591-871d-e4bdc0b4be4f/53606607271.pdfIn PDF document text
    • https://s3.amazonaws.com/nilititonawafim/41547970006.pdfIn PDF document text
    • https://s3.amazonaws.com/gixawetopoli/gotubifozikexitatumi.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000108dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108DC 5660 bytes
SHA-256: 92195e3b11ced0321b0dc0eb25556de01eceb0c9d0acfc8ab456bb5f173a2cd5
font_01_sfnt_off00011c04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C04 10808 bytes
SHA-256: eda797762de10992b80503e97dac8ec798eaa24e85d45e0372db87e4d0da118c